Oxygen breathing unit



FIG. 1 is a perspective view of an oxygen breathing unit showing our new design;

FIG. 2 is a front elevational view thereof the rear elevational view being identical thereto;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view showing a top cover open and an oxygen breathing mask stowed in a storage portion; and,

FIG. 8 is a perspective view showing an oxygen breathing unit in use.

A rear elevational view is symmetrical with the front elevational view. 

The ornamental design for an oxygen breathing unit, as shown and described. 